Pencil sharpener



May 12, 1931. THOMPSON 1,804,717

PENCIL SHARPENER Filed May 3, 1929 Patented May 12, 193

f' ritS FRr'aNKTHOMPSON, .OF CAMDEN, NEYN 'JERSEY, ASSIGNOR' TO C. HOWARD HUNT PEN, COMPANY, OF CADIDEN, NEW JERSEY, A"CORPORAT101 T OF NEW JERSEY PENCIL Sammy-Es Application filed May 3,

1 to the provision of means for insuring unin- 1 tentional removal of the chip receptacle.

As is well known, pencil sharpener-s comprise a support adapted to be secured to a wall, table, or the like, and from which is supported a sharpening device, a chip receptacle, removably attached to the support,

10 being provided to collect the chips resulting from the sharpeningoperation. In pencil Sharpeners as heretofore constructed the 0111p receptacle has been attached to the support through the medium of a bayonet joint which 15 act-s to desirably position the chip receptacle,

but which has no capacity for retaining the receptacle if it he accidentally moved in a directionto release the oint.

In the case of pencil sharpeners as here '20 tofore constructed, the chip receptacles are frequently detached from the support and their contents spilled inadvertently, as by being brushed by a person passing, or otherwise.

Now it is the vide means for insuring against accidental detachment of the chip receptacle Without at the same time rendering its detachment when desired anymore difficult than in present structureal i In accordance with my invention, I provide',in addition to the usual form of con nection between the chip receptacle and support, resilient means adapted to releasably lock the receptacle to the support after it is attached thereto through the medium of the ordinary attaching means. In accordance with my invention I may, for example, provide a spring catch, whichmay be conven-- iently carried by the chip receptacle in such a position as to engage with the support when the chip receptacle is attached thereto in' the usual manner.

The resilient means in accordance with my invention, as, for example, a spring catch, may be readily released, but when engaged will prevent turning of the chip receptacle in a direction t-o'release the receptacle from the ordinary means by which it is attached to the support, thus inobject of my invention to pro- {1929. Serial no. 360,142.

'suring against accidental release of the rece pta cle.

ture' and purpose of my invention, I will there has been illustrated a preferred em bodiment andin which:

Fig. 1 is a side elevation ofa pencil sharpener embodying my invention. 7

Fig. 2 is a rear end elevation of the chip receptacle embodying my invention.

Fig. 3 is sectional View on line 33 of Fig. 1. k

4 isa perspective view partly in section of an element-of a bayonet joint for attaching the t-hip receptacle tothe support. In the drawings, A is. a support provided with a base portion 6 and a head 0. Within tion 0, all as is usualin pencil sharpeners.

is a chip receptacle of any desired construction, as, for example, having heads i be-" 'tween which. is arranged a body of transparent material. Therear head i of the chip receptacle 18 provided with an aperture about which is oneelement 76 of a bayonet joint adapted to cooperate with complementary elements Z provided on a flange m, carried by the head portion a of the support. The forward head z'of the chip receptacle is provided to be sharpened-and desirably with a gauge a for the'support' of various sizes of pencils. The gauge a,flwhich, as is well known, isprovi'ded with a number of apertures of dilferent sizes, is pivotally connected to the head 2 in order that,rby its rotation, its various apertures -may be respectively aligned with the "pencil inserting aperture in the head.

. On the rear head i of the chip receptacle is secured a spring catch 0 and where, as is usual,

Having indicated in a general Way the na the head portionc of the sup is the al, i

dle D and'provided with a pencil guide f, which carries cutters G G provided with gears meshing with the gear in the head p-orwithan aperturefor the insertion of a pencil Fri in Fig. 3, the chip receptacle cannot be moved a normal position, thus fully closing the joint.

When the bayonet joint is fully engaged, the chip receptacle can only be turned out of normal position in reverse direction to that in which it is turned to close the joint; The

spring catch 0 is so arranged that when the receptacle reaches normal position the catch will engage within thebody of the support, as

i clearly shown in Fig. 3. With the bayonet joint closed and the catch 0 engaged, as shown in either direction and hence accidental release of the bayonet joint is positively prevented. When it is desired to detach the chip receptacle from the support, for example, for the purpose of emptying out the chips, such may be readily accomplished by releasing the ment of the receptacle and support to hold the former on the latter, and releasable c0- operating means on the receptacle and support operative to prevent a reverse rotary movement tending to disengage thefirst 1 mentioned means.

4. In a pencil sharpener, in combination, a support, a chip receptacle, bayonet joint connecting means on the chip receptacle and support engaged by relative rotary movement of the receptacle and support to hold the former on the latter, and releasable spring detent 'means operative to prevent a reverse rotary movement tending to disengage the first mentioned means.

In testimony of which invention, I have hereunto set my hand, at Camden, New Jersey, on this 29th day of April, 1929.

' FRANK THOMPSON.

spring catch 0, which permits the receptacle i to be turned in a direction to release the bayonet joint. a

, It will now be observed that by virtue of my invention the accidental detachment of chip receptacles is positively eliminated and,

at the same time, when detachment is desired, such may be readily accomplished.

It willbe appreciated that I do not intendv i that my invention shall be limited to the particular structure disclosed herein by way of illustration, since it will be obvious that the purposes of my invention may be accomplished by a variety of, embodiments differing variously from that shown. What I claim anddesire to ters Patent is:

1. In a pencil sharpener, in combination, a support, a chip receptacle, means on the chip receptacle and support engaged by relative protect by Letleasable cooperating means on the receptacle and support operative to prevent a reverse rotary movement tending to disengage the first mentioned means.

2. In a pencil sharpener, in combination, a

support, a chip receptacle, means on the chip receptacle and support engaged by relative rotary movement of the receptacle and sup- I port to hold the former on the latter, and

releasable spring detent means operative to prevent a reverse rotary movementtending to disengage the first mentionedmeans.

3. In a pencil sharpener, incombination, a support, a chip receptacle, bayonet joint. connecting means on the chip receptacle'fand support engaged by relative rotary moverotary movement of the receptacle and support to hold the former on the latter, and rev 

